The reliability of the spring thimble begins with the material selection of the three core parts of the needle (plunger), needle tube and spring. The needle/needle tube BeCu has the best comprehensive performance. The conductivity can reach 50% IACS, and the hardness is high (180-200HV). With excellent conductivity, elasticity and corrosion resistance, it is the first choice for high-end applications. But the cost is high, and attention should be paid to the toxicity protection of beryllium during processing.
Phosphor bronze is a cost-effective choice. The conductivity is slightly lower than that of beryllium copper, but the elasticity and corrosion resistance are better than that of brass, which can meet the needs of mid end applications and has more cost advantages.
Brass low cost solution. It has good conductivity, but relatively low strength, elasticity and corrosion resistance. It is suitable for scenarios with less plugging times and mild environment.
Stainless steel has high strength and temperature resistance. The hardness can reach 200-250HV, and can withstand the operating temperature up to 250 ° C, suitable for high wear or extreme environment. But the conductivity is relatively poor
Post time: Apr-16-2026